%0 Journal Article
%T Non-stationary elastic wavefields from an apodized normal transducer. Near-field asymptotics and numerics
%+ Propagation des Ondes : Étude Mathématique et Simulation (POEMS)
%A Bécache, Eliane
%A Kiselev, Aleksei
%< avec comité de lecture
%@ 1610-1928
%J Acta Acustica united with Acustica
%I Hirzel Verlag
%V 91
%N 5
%P 822-830
%8 2005
%D 2005Journal articles
%X We simulate non-stationary radiating near-field of a normal transducer acting at the surface of an isotropic homogeneous elastic half-space. The transducer is assumed large compared to the characteristic wavelength. Effects of non-constance of distribution of pressure over the aperture of the transducer on the wavefield are considered in detail. These are i) excitation of a plane S-wave, ii) anomalous polarization in the plane P-wave, and iii) suppression of edge waves by an apodization of the pressure distribution. Asymptotic formulas are tested against a numerical method based on new mixed finite elements. The agreement is found excellent within the bounds of the asymptotic theory.
%G English
%L hal-00982677
%U https://ensta-paris.hal.science/hal-00982677
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